A high-water-level floodplain soft soil roadbed structure and construction method

Abstract

The present application relates to a high-water-level floodplain soft soil roadbed structure and construction method, belonging to the field of soft-bed foundation construction technology, which includes interlocking piles and supporting piles, wherein the interlocking piles are arranged in the soil layer of the floodplain along the outer contour of the floodplain, and the supporting piles are arranged in the soil layer of the floodplain. The interlocking piles are closer to the river than the supporting piles, and the soil layer on the interlocking piles is provided with a first backfill soil, and a supporting wall is arranged on the side of the first backfill soil facing the river, and a road is paved on the first backfill soil. The present application has the effect of reducing water and soil loss in the floodplain roadbed, thereby causing the road surface to settle in the later stage.

Description

Technical Field

[0001] The present application relates to the technical field of soft foundation construction, and in particular to a high-water-level floodplain soft soil roadbed structure and a construction method. Background Art

[0002] The floodplain is the valley bottom outside the riverbed that is submerged during the flood season. It is formed by the lateral migration of the river and the sedimentation of the flood overbank. Floodplains in plain areas are more likely to develop. Due to the lateral circulation, the V-shaped river valley widens, and alluvial deposits form shallows. The shallows widen, and a large area emerges from the water during the dry season to become a prototype floodplain. After that, the materials carried by the flood continue to deposit and form a floodplain. In the reinforcement treatment of soft foundations such as floodplains, sandstone piles are often used to treat soft soil foundations.

[0003] Regarding the above-mentioned related technologies, gravel piles are made by squeezing sand or pebbles or gravel, crushed stone into holes. The soft soil in the floodplain has a high moisture content, and water can easily flow through the sand or pebbles or gravel, crushed stone in the gravel piles, which can easily lead to soil erosion and cause road settlement. Summary of the invention

[0004] In order to reduce the soil erosion in the floodplain roadbed and thus reduce the subsequent road surface settlement, the present application provides a high-water-level floodplain soft soil roadbed structure and a construction method.

[0005] The application provides a high-water level floodplain soft soil roadbed structure that adopts the following technical solutions:

[0006] A high-water-level floodplain soft soil roadbed structure comprises interlocking piles and supporting piles, wherein the interlocking piles are arranged in the soil layer of the floodplain along the outer contour of the floodplain, and the supporting piles are arranged in the soil layer of the floodplain. The interlocking piles are closer to the river than the supporting piles, and the soil layer on the interlocking piles is provided with a first backfill soil, a supporting wall is provided on the side of the first backfill soil facing the river, and a road is paved on the first backfill soil.

[0007] By adopting the above technical solution, the interlocking piles can effectively prevent the soil and water loss in the floodplain soil layer from entering the river, and during the drilling construction of the supporting piles, the soil layer between the supporting piles and the interlocking piles is squeezed and compacted, thereby reducing the soil and water loss in the floodplain and the settlement of the road on the roadbed floodplain caused by the nature of the soft geology. The first backfill soil and supporting wall raise the road elevation to prevent the road from being submerged by the river when the water level is high.

[0008] Optionally, a foundation pit is excavated on the floodplain along its outer contour, the foundation pit is located above the interlocking piles, a second backfill soil is arranged in the foundation pit, backfill concrete is poured on the second backfill soil, the supporting wall is connected to the backfill concrete, and steps are arranged on the supporting wall.

[0009] By adopting the above technical solution, the foundation pit is set up to trim the river bank of the floodplain to facilitate the second backfill. The second backfill raises the elevation of the river bank of the floodplain and reduces the flooding of the river bank during high water levels. The backfill concrete is used as a pedestrian road, so that people can go to the backfill concrete for hiking through the steps.

[0010] Optionally, a temporary baffle is inserted into a side of the floodplain close to the river, the temporary baffle surrounds the bite pile, the bite pile includes a first wall protection sleeve and a plurality of second wall protection sleeves, the first wall protection sleeve is provided with a first grouting hole, the first wall protection sleeve is provided with a first plug-in groove, the second wall protection sleeve is provided with a second grouting hole, the first grouting hole and the second grouting hole are both opened toward the supporting pile, high-pressure waterproof mortar is injected between the bottom of the supporting pile and the soil layer through the first grouting hole and the second grouting hole, the second wall protection sleeve is provided with a second plug-in groove and a second plug-in block, the second plug-in block adjacent to the first wall protection sleeve is inserted into the first plug-in groove, and the other second plug-in blocks are inserted into the second plug-in grooves of the second wall protection sleeves adjacent thereto;

[0011] The first wall protection sleeve is provided with a first connection hole, the second wall protection sleeve is provided with a second connection hole, the first connection hole is connected to the second connection hole, two adjacent second connection holes are connected, and the first wall protection sleeve and the second wall protection sleeve are both filled with first plain concrete.

[0012] By adopting the above technical solution, the second plug-in block is inserted into the first plug-in slot, a second wall protection sleeve is connected to the first wall protection sleeve, and other second plug-in blocks are inserted into adjacent second plug-in slots. Adjacent second wall protection sleeves are connected to each other, and then high-pressure waterproof mortar is poured through the first grouting hole and the second grouting hole, thereby reducing the situation where water bubbling from the bottom of the supporting pile affects the concrete strength of the supporting pile during construction. The first plain concrete is poured into the first wall protection sleeve and the second wall protection sleeve through the first connecting hole and the second connecting hole, so that the first plain concrete in the first wall protection sleeve and the second wall protection sleeve interlocks with each other, thereby improving the water-blocking effect of the interlocking pile.

[0013] Optionally, a first partition is provided in the first wall protection sleeve, and a second partition is provided in the second wall protection sleeve. A first water inlet hole and a first drain hole are provided on the first wall protection sleeve, and a second water inlet hole and a second drain hole are provided on the second wall protection sleeve. The first water inlet hole and the first drain hole are both located below the first partition, and the second water inlet hole and the second drain hole are both located below the second partition. The first water inlet hole and the second water inlet hole have the same elevation, and filter nets are provided in the first water inlet hole and the second water inlet hole. The elevations of the first drain hole and the second drain hole are higher than those of the second water inlet hole. The opening directions of the first water inlet hole and the second water inlet hole are toward the supporting piles, and the opening directions of the first drain hole and the second drain hole are toward the floodplain bank. The first drain hole and the second drain hole of the second guard arm at the end are both connected with a drain pipe, and the drain pipe extends into the river.

[0014] By adopting the above technical scheme, construction is carried out when the river is at a low water level, and the water in the high-potential soil layer of the floodplain will flow into the interlocking piles through the first water inlet and the second water inlet. When the water level reaches a certain height, it will flow into the river through the first drain outlet and the second drain outlet through the drain pipe, and then the floodplain soil will be compacted. When the water in the floodplain soil is lost to a certain extent, the water pressure in the river is balanced with the water pressure in the floodplain soil layer. At this time, the water content of the compacted floodplain soil layer is reduced, which is beneficial to improve the properties of the soft foundation of the floodplain soil layer, thereby reducing the phenomenon of road sedimentation in the later period. When the river is at a high water level, since the road has been constructed and due to the effect of high-pressure waterproof mortar, the high water level water will not flow into the soil layer below the road, thereby reducing the road seepage. The filter net reduces the loss of soil when the soil layer is drained.

[0015] Optionally, the supporting piles include a supporting wall protection sleeve, and a second plain concrete is poured into the supporting wall protection sleeve.

[0016] Optionally, a mounting seat is provided on the supporting wall, a protective wall is provided on the mounting seat, and the elevation of the protective wall is higher than the elevation of the road.

[0017] The present application also provides a high-water level floodplain soft soil roadbed construction method using the following technical solution:

[0018] A high-water-level floodplain soft soil roadbed construction method comprises the following construction steps: S1, temporary baffle construction; S2, foundation pit excavation, and insertion of a first wall protection sleeve and a second wall protection sleeve into a soil layer; S3, drainage pipe construction; S4, insertion of a supporting wall protection sleeve into a soil layer; S5, soil compaction; S6, backfilling of a second backfill soil; S7, grouting of high-pressure waterproof mortar; S8, pouring of a first plain concrete and a second plain concrete; S9, backfill concrete construction; S10, removal of temporary baffles; S11, construction of a first backfill soil, a supporting wall and a road; S12, construction of a mounting seat and a protective wall.

[0019] Optionally, during the construction of S1, the temporary baffle, the insertion design depth of the temporary baffle should be greater than or equal to the design depth of the first baffle and the second baffle, and before the backfill concrete construction in S6, the side of the temporary baffle facing the foundation pit should be coated with a release agent.

[0020] By adopting the above technical solution, the temporary baffle reduces the high-pressure waterproof mortar injected into the soil layer and flows into the river, and the release agent of the temporary baffle facilitates the separation of the baffle from the backfill concrete.

[0021] Optionally, before the construction of the interlocking piles in step S2, it is necessary to locate and mark out the positions of the first wall protection sleeve and each of the second wall protection sleeves, and adopt a construction method in which drilling and placing the second wall protection sleeves are carried out simultaneously, with at least one drill hole between the current drill hole and the currently placed second wall protection sleeve, and the design heights of the first wall protection sleeve and the second wall protection sleeve should be higher than the design height of the second backfill soil.

[0022] By adopting the above technical solution, the position deviation of the first wall protection sleeve and the second wall protection sleeve is reduced.

[0023] Optionally, step S6 should be implemented when the river is at low water level. In step S8, the side of the second backfill soil close to the river bank should be set as a slope, and the supporting wall should be built with solid bricks. In step S9, the mounting seat is cast by concrete and cast in place on the top of the supporting wall.

[0024] By adopting the above technical solution, low-water-level rivers facilitate excavation of foundation pits, and are also conducive to reducing the moisture content in the soil layer through the first wall protection sleeve and the second wall protection sleeve. The mounting seat made of concrete is less likely to break than solid bricks, which reduces the possibility of the mounting seat breaking when the protective wall is impacted.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The construction of interlocking piles and supporting piles makes the soil layer between them more compact, improving the properties of the soft-sleeping foundation. The interlocking piles block the water in the soil layer from flowing to the river, reducing the high water content of the floodplain soil at high water levels and the large soil erosion at low water levels, which leads to sedimentation on the road.

[0027] 2. When the river water level is low, after the supporting wall sleeve, the first wall sleeve and the second wall sleeve are inserted into the soil layer, the soil is compacted. At this time, the moisture content of the floodplain soil is low, and high-pressure waterproof mortar is injected through the second wall sleeve to reduce the upward flow of water in the soil layer during the pouring of the supporting piles, which affects the concrete strength of the supporting piles.

[0028] 3. When the river is at a high water level, the high-pressure waterproof mortar reduces the flow of water into the soil layer of the road, thereby reducing the change in soil moisture content as the river water level changes between high and low water levels. When the soil moisture content decreases, the gaps between the soil bodies increase and the road settlement occurs due to soil erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0030] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0031] Figure 3 It is a schematic diagram of the structure of the first wall protection sleeve used in an embodiment of the present application.

[0032] Figure 4 It is a schematic diagram of the structure of the first partition used in an embodiment of the present application.

[0033] Figure 5 It is a schematic diagram of the structure of the second wall protection sleeve used to embody the embodiment of the present application.

[0034] Figure 6 yes Figure 5 Schematic diagram of the enlarged portion B.

[0035] Figure 7 It is a schematic diagram of the structure of the second wall protection sleeve embodied in an embodiment of the present application.

[0036] Figure 8 It is a schematic diagram of the structure of a drain pipe used in an embodiment of the present application.

[0037] Fig. 9 It is a flow chart of an embodiment of the present application for reflecting a method for constructing a high-water-level floodplain roadbed.

[0038] Explanation of the reference numerals: 1. interlocking pile; 11. first wall protection sleeve; 111. first grouting hole; 112. first connecting hole; 113. first water inlet hole; 114. first drainage hole; 115. first plug-in slot; 12. second wall protection sleeve; 121. second plug-in slot; 122. second plug-in block; 123. second water inlet hole; 124. second drainage hole; 125. second grouting hole; 126. second connecting hole; 13. first partition; 14. second partition; 15. drainage pipe; 16. filter screen; 17. first plain concrete; 2. supporting pile; 21. supporting wall sleeve; 22. high-pressure waterproof mortar; 23. second plain concrete; 3. temporary baffle; 4. foundation pit; 41. second backfill; 42. backfill concrete; 5. first backfill; 6. supporting wall; 7. step; 8. mounting seat; 81. protective wall; 9. road. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-9 This application is described in further detail.

[0040] The embodiment of the present application discloses a high-water-level floodplain soft soil roadbed structure.

[0041] like Figure 1 A high-water-level floodplain soft soil roadbed structure includes a snap pile 1 and a support pile 2. A temporary baffle 3 is inserted along the river bank of the floodplain. A foundation pit 4 is excavated on one side of the floodplain close to the river bank. The snap pile 1 is inserted into the soil of the floodplain. The snap pile 1 is located below the foundation pit 4. The snap pile 1 is arranged along the outer contour of the floodplain. The foundation pit 4 is backfilled with a second backfill soil 41. The top of the snap pile 1 is higher than the top of the second backfill soil 41. A space is left between the second backfill soil 41 and the temporary baffle 3. The surface of the second backfill soil 41 is poured with backfill concrete 42, which fills the space between the temporary baffle 3 and the second backfill soil 41, and is connected to the bite pile 1. The design elevation of the second backfill soil 41 is higher than the elevation of the floodplain before excavation (anti-high water level), and the support piles 2 are arranged in the soil of the floodplain. The support piles 2 are relatively far away from the floodplain bank and the arrangement of the support piles 2 is the same as the contour of the floodplain bank.

[0042] like Figure 1 A first backfill soil 5 is arranged on the soil layer of the supporting pile 2, and the first backfill soil 5 is inclined toward the side of the river. A supporting wall 6 is arranged on the side of the first backfill soil 5 facing the river. The supporting wall 6 is built with solid bricks, and the supporting wall 6 is connected to the backfill concrete 42. A step 7 is arranged on the supporting wall 6. A mounting seat 8 is arranged on the top of the supporting wall 6. The mounting seat 8 is cast in place by concrete formwork, and a protective wall 81 is arranged on the mounting seat 8. A road 9 is paved on the first backfill soil 5, and the design elevation of the protective wall 81 is higher than the design specific height of the road 9.

[0043] When the river is at a low water level, a temporary baffle 3 is inserted into the river bank to surround the river bank to reduce the situation where the river water level rises and the river bank is submerged during construction. The foundation pit 4 is excavated to remove the river bank silt, and then the bite pile 1 is inserted and the second backfill soil 41 is backfilled. The design elevation of the second backfill soil 41 should not be lower than the elevation of the river at a high water level, and backfill concrete 42 is poured on the second backfill soil 41. The bite pile 1 is connected to the backfill concrete 42. Then, the support pile 2 is inserted into the floodplain soil, and the first backfill soil 5 is backfilled above the support pile 2. The elevation of the first backfill soil 5 is higher than the elevation of the backfill concrete 42. Then, the support wall 6 and the step 7 are built on the inclined surface of the first backfill soil 5, and then the mounting seat 8 is cast on the support wall 6. The support wall 6 is designed on the mounting seat 8, and finally the road 9 is paved on the first backfill soil 5.

[0044] When the interlocking pile 1 is inserted into the soil, the water in the floodplain soil on the side of the interlocking pile 1 away from the river bank is blocked by the interlocking pile 1, thereby reducing the soil erosion of the floodplain soil and reducing the settlement of the road 9 caused by soil erosion.

[0045] After the construction of the interlocking pile 1 is completed, the supporting pile 2 is inserted into the floodplain soil. At this time, the floodplain soil between the supporting pile 2 and the interlocking pile 1 is squeezed and compacted, which improves the properties of the soft sleeping foundation and further reduces the settlement of the road 9.

[0046] like Figure 2 , Figure 3 and Figure 4 The interlocking pile 1 includes a first wall protection sleeve 11 and a plurality of second wall protection sleeves 12. A first partition 13 is arranged in the first wall protection sleeve 11. A first grouting hole 111 and a first connecting hole 112 are opened on the side wall of the first wall protection sleeve 11. The first grouting hole 111 and the first connecting hole 112 are both located above the first partition 13. The first grouting hole 111 is closer to the first partition 13 than the first connecting hole 112. The first connecting hole 112 is a long hole. A first water inlet hole 113 and two first drainage holes 114 are also opened on the first wall protection sleeve 11. The first water inlet hole 113 and the first drainage holes 114 are both located below the first partition 13. The first water inlet hole 113 is located below the first drainage hole 114. The first water inlet hole 113 is opened on the side of the first wall protection sleeve 11 away from the river, and the first water outlet hole is opened toward the river. A first inserting groove 115 is formed on the side surface of the first wall protection sleeve 11 . The first inserting groove 115 extends from the top of the first wall protection sleeve 11 to the bottom of the first wall protection sleeve 11 .

[0047] like Figure 5 , Figure 6 and Figure 7A second plug-in slot 121 and a second plug-in block 122 are provided on the side of the second wall protection sleeve 12 . The second plug-in block 122 and the second plug-in slot 121 both extend from the top of the second wall protection sleeve 12 to the bottom of the second wall protection sleeve 12 .

[0048] like Figure 2 , Figure 5 and Figure 6 A second partition plate 14 is provided in the second wall protection sleeve 12. A second water inlet hole 123 and two second drainage holes 124 are provided on the second wall protection sleeve 12. The second water inlet hole 123 and the second drainage holes 124 are both located below the second partition plate 14. The second water inlet hole 123 is located below the second drainage holes 124. A second grouting hole 125 and a second connecting hole 126 are provided on the second wall protection sleeve 12. The second connecting hole 126 and the second grouting hole 125 are both located above the second partition plate 14. The second grouting hole 125 faces the supporting pile 2. The second connecting hole 126 is a long strip hole. A filter screen 16 is provided at both the first water inlet hole 113 and the second water inlet hole 123.

[0049] like Figure 8 , the second plug-in block 122 of one of the second wall protection sleeves 12 is inserted into the first plug-in slot 115, and the second plug-in blocks 122 of the remaining second wall protection sleeves 12 are plugged into the second plug-in slots 121 of the second wall protection sleeves 12 adjacent thereto. The first wall protection sleeve 11 and a plurality of second wall protection sleeves 12 are arranged along the contour direction of the floodplain, the first drainage hole 114 is connected to the adjacent second drainage hole 124, the second drainage hole 124 is connected to the adjacent second drainage hole 124, the first connection hole 112 is connected to the adjacent second connection hole 126, and the second connection hole 126 is connected to the adjacent second connection hole 126. A drainage pipe 15 is connected to one of the first drainage holes 114, and a second drainage hole 124 of the second wall protection sleeve 12 away from the first wall protection sleeve 11 is connected to the drainage pipe 15, and the drainage pipe 15 extends out of the floodplain soil.

[0050] like Figure 1 The supporting pile 2 includes a supporting wall sleeve 21, which is inserted into the floodplain soil layer. High-pressure waterproof mortar 22 is poured between the bottom of the supporting wall sleeve 21 and the soil through the first grouting hole 111 and the second grouting hole 125. The first plain concrete 17 is poured into the first wall sleeve 11 and the second wall sleeve 12, and the first plain concrete 17 flows into the plurality of second wall sleeves 12 through the first connecting hole 112 and the second connecting hole 126. The second plain concrete 23 is poured into the supporting wall sleeve 21.

[0051] When the river is at a low water level, the supporting wall protection sleeve 21, the first wall protection sleeve 11 and the second wall protection sleeve 12 are inserted into the soil layer and the soil is compacted. At this time, the water in the soil flows into the first wall protection sleeve 11 and the second wall protection sleeve 12 through the first water inlet hole 113 and the second water inlet hole 123, and then is discharged from the river from the drain pipe 15. High-pressure waterproof mortar 22 is injected between the bottom wall of the supporting wall protection sleeve 21 and the soil. The high-pressure waterproof mortar 22 fills the gaps between the soil and squeezes the soft soil, and finally forms a continuous waterproof layer at the bottom of the supporting wall protection sleeve 21, thereby reducing the moisture content of the soil, and the compacted soil is more compact, further improving the properties of the soft foundation. When the water level rises, the high-pressure waterproof mortar 22 reduces the water flowing into the soil under the road 9, thereby reducing the situation where soil erosion causes the road 9 to sink when the water level drops again next time.

[0052] The implementation principle of the embodiment of the present application is: the first wall protection sleeve 11 and the second wall protection sleeve 12 are plugged into each other to form a continuous enclosure, so as to reduce the soil erosion in the floodplain when the water level drops. The supporting wall protection sleeve 21 cooperates with the first wall protection sleeve 11 and the second wall protection sleeve 12 when inserted into the soil to squeeze the soil around the road 9, making the soil more compact, and reduces the situation where the water level of the river rises and presses the water into the soil under the road 9 through the high-pressure waterproof mortar 22, thereby reducing the later settlement of the road 9 on the floodplain.

[0053] The embodiment of the present application also discloses a method for constructing a high-water-level floodplain soft soil roadbed.

[0054] like Fig. 9 A high-water-level floodplain soft soil roadbed construction method comprises the following construction steps: S1, construction of temporary baffle 3; S2, excavation of foundation pit 4, insertion of first guard arm sleeve and second guard arm sleeve into soil layer; S3, construction of drainage pipe 15; S4, insertion of support guard arm sleeve into soil layer; S5, compaction of soil; S6, backfilling of second backfill soil 41; S7, grouting of high-pressure waterproof mortar 22; S8, pouring of first plain concrete 17 and second plain concrete 23; S9, construction of backfill concrete 42; S10, removal of temporary baffle 3; S11, construction of first backfill soil 5, supporting wall 6 and road 9; S12, construction of mounting seat 8 and protective wall 81.

[0055] After the supporting wall protection sleeve 21, the first wall protection sleeve 11 and the second wall protection sleeve 12 are inserted into the soil layer, the soil is compacted to squeeze the water in the soil into the river through the first wall protection sleeve 11 and the second wall protection sleeve 12, and the high-pressure waterproof mortar 22 is injected to reduce the situation where water flows back into the soil at high water level and causes the soil gap to increase. This improves the properties of the soft sleeping foundation of the soil and reduces the settlement of the road 9 in the later stage.

[0056] During the construction of S1 and the temporary baffle 3, the design depth of the temporary baffle 3 inserted into the soil should be greater than or equal to the design depth of the first baffle 13 and the second baffle 14, but must not exceed the design depth of the first drainage hole 114 and the second drainage hole 124. Before backfilling concrete 42 in S9, a release agent should be applied to the side of the temporary baffle 3 facing the foundation pit 4.

[0057] The temporary baffle 3 should exceed the first baffle 13 and the second baffle 14 to reduce the possibility that the high-pressure waterproof mortar 22 flows into the river during high-pressure grouting, resulting in defects in the waterproof layer formed at the bottom of the supporting wall sleeve 21.

[0058] Before the construction of the interlocking pile 1 in step S2, it is necessary to locate and lay out the positions of the first wall protection sleeve 11 and each second wall protection sleeve 12, and install the second wall protection sleeve 12 while drilling. There is at least one drilling hole between the current drilling hole and the currently installed second wall protection sleeve 12, and the design height of the first wall protection sleeve 11 and the second wall protection sleeve 12 should be higher than the design height of the second backfill 41.

[0059] The drilling and installation are carried out simultaneously to reduce the collapse of the hole wall after drilling, so that the first wall protection sleeve 11 and the second wall protection sleeve 12 can be smoothly inserted into the soil layer.

[0060] Step S6 should be implemented when the river is at low water level. In step S8, the side of the second backfill 41 close to the river bank should be set as a slope, and the supporting wall 6 should be built with solid bricks. In step S9, the mounting seat 8 is formed by pouring concrete and cast-in-place is performed on the top of the supporting wall 6.

[0061] Construction is carried out during the period of low river water level, firstly to reduce the safety risk of construction, and secondly to allow more water to be discharged from the soil when compacting the soil, thereby reducing the moisture content in the soil and reducing the risk of road 9 settlement.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-water-level floodplain soft soil roadbed structure, characterized in that: The invention comprises a snap pile (1) and a support pile (2), wherein the snap pile (1) is arranged in the soil layer of the floodplain along the outer contour of the floodplain, and the support pile (2) is arranged in the soil layer of the floodplain. The snap pile (1) is closer to the river than the support pile (2). The soil layer on the snap pile (1) is provided with a first backfill soil (5), a supporting wall (6) is arranged on the side of the first backfill soil (5) facing the river, and a road (9) is paved on the first backfill soil (5); A temporary baffle (3) is inserted on the side of the floodplain close to the river, and the temporary baffle (3) surrounds the bite pile (1). The bite pile (1) comprises a first wall protection sleeve (11) and a plurality of second wall protection sleeves (12). The first wall protection sleeve (11) is provided with a first grouting hole (111), the first wall protection sleeve (11) is provided with a first insertion groove (115), and the second wall protection sleeve (12) is provided with a second grouting hole (125). The opening directions of the first grouting hole (111) and the second grouting hole (125) are both oriented toward the The supporting pile (2), high-pressure waterproof mortar (22) is injected between the bottom of the supporting pile (2) and the soil layer through the first grouting hole (111) and the second grouting hole (125), the second wall protection sleeve (12) is provided with a second plug-in groove (121) and a second plug-in block (122), the second plug-in block (122) adjacent to the first wall protection sleeve (11) is inserted into the first plug-in groove (115), and the other second plug-in blocks (122) are inserted into the second plug-in grooves (121) of the second wall protection sleeves (12) adjacent thereto; The first wall protection sleeve (11) is provided with a first connection hole (112), the second wall protection sleeve (12) is provided with a second connection hole (126), the first connection hole (112) is communicated with the second connection hole (126), two adjacent second connection holes (126) are connected, and the first wall protection sleeve (11) and the second wall protection sleeve (12) are both filled with first plain concrete (17).

2. The high water level floodplain soft soil roadbed structure according to claim 1, characterized in that: A foundation pit (4) is excavated on the floodplain along the outer contour thereof, the foundation pit (4) being located above the interlocking pile (1), a second backfill soil (41) being arranged in the foundation pit (4), backfill concrete (42) being poured on the second backfill soil (41), the support wall (6) being connected to the backfill concrete (42), and a step (7) being arranged on the support wall (6).

3. The high water level floodplain soft soil roadbed structure according to claim 2, characterized in that: A first partition (13) is arranged in the first wall protection sleeve (11), and a second partition (14) is arranged in the second wall protection sleeve (12); a first water inlet hole (113) and a first drainage hole (114) are provided on the first wall protection sleeve (11), and a second water inlet hole (123) and a second drainage hole (124) are provided on the second wall protection sleeve (12); the first water inlet hole (113) and the first drainage hole (114) are both located below the first partition (13), and the second water inlet hole (123) and the second drainage hole (124) are both located below the second partition (14); the first water inlet hole (113) and the second water inlet hole (123) are The first water inlet hole (113) and the second water inlet hole (123) have the same elevation, and a filter screen (16) is provided inside each of the first water inlet hole (113) and the second water inlet hole (123); the elevations of the first drainage hole (114) and the second drainage hole (124) are both higher than those of the second water inlet hole (123); the opening directions of the first water inlet hole (113) and the second water inlet hole (123) are oriented toward the support pile (2); the opening directions of the first drainage hole (114) and the second drainage hole (124) are oriented toward the floodplain bank; the first drainage hole (114) and the second drainage hole (124) of the second wall protection sleeve (12) located at the end are both connected to a drainage pipe (15), and the drainage pipe (15) extends into the river.

4. The high water level floodplain soft soil roadbed structure according to claim 3, characterized in that: The supporting pile (2) comprises a supporting wall protection sleeve (21), and a second plain concrete (23) is poured into the supporting wall protection sleeve (21).

5. The high water level floodplain soft soil roadbed structure according to claim 4, characterized in that: The supporting wall (6) is provided with a mounting seat (8), and the mounting seat (8) is provided with a protective wall (81), and the elevation of the protective wall (81) is higher than the elevation of the road (9).

6. A method for constructing a high-water-level floodplain soft soil roadbed, comprising a high-water-level floodplain soft soil roadbed structure according to claim 5, characterized in that: The method comprises the following construction steps: S1, construction of a temporary baffle (3); S2, excavation of a foundation pit (4), and insertion of a first wall protection sleeve (11) and a second wall protection sleeve (12) into a soil layer; S3, construction of a drainage pipe (15); S4, insertion of a supporting wall protection sleeve (21) into a soil layer; S5, compaction of the soil body; S6, backfilling of a second backfill soil (41); S7, grouting of a high-pressure waterproof mortar (22); S8, pouring of a first plain concrete (17) and a second plain concrete (23); S9, construction of backfill concrete (42); S10, removal of the temporary baffle (3); S11, construction of a first backfill soil (5), a supporting wall (6) and a road (9); S12, construction of a mounting seat (8) and a protective wall (81).

7. The construction method of a high-water-level floodplain soft soil roadbed according to claim 6, characterized in that: During the construction of S1, the temporary baffle (3), the insertion design depth of the temporary baffle (3) should be greater than or equal to the design depth of the first baffle (13) and the second baffle (14). Before the backfilling of concrete (42) in S9, a release agent should be applied to the side of the temporary baffle (3) facing the foundation pit (4).

8. The construction method of a high-water-level floodplain soft soil roadbed according to claim 6, characterized in that: Before the construction of the interlocking pile (1) in step S2, it is necessary to locate and lay out the positions of the first wall protection sleeve (11) and each of the second wall protection sleeves (12), and adopt a construction method in which drilling and placement of the second wall protection sleeves (12) are carried out simultaneously, with at least one drill hole being spaced between the current drill hole and the currently placed second wall protection sleeve (12), and the design heights of the first wall protection sleeve (11) and the second wall protection sleeve (12) should be higher than the design height of the second backfill soil (41).

9. The method for constructing a high-water-level floodplain soft soil roadbed according to claim 6, characterized in that: Step S6 should be implemented when the river is at a low water level. In step S8, the side of the second backfill soil (41) close to the river bank should be set as a slope, and the supporting wall (6) should be built with solid bricks. In step S9, the mounting seat (8) should be cast in concrete and cast in place on the top of the supporting wall (6).

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